<?php


namespace App\Rules;


use Illuminate\Contracts\Validation\Rule;

class IDNumber implements Rule
{
    /**
     * Determine if the validation rule passes.
     *
     * @param string $attribute
     * @param mixed $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        $regx = "/^(\d{6})+(\d{4})+(\d{2})+(\d{2})+(\d{3})([0-9]|X)$/";
        @preg_match($regx, $value, $arr_split);
        $dtm_birth = $arr_split[2] . '/' . $arr_split[3] . '/' . $arr_split[4];
        if (!strtotime($dtm_birth)) //检查生日日期是否正确
        {
            return FALSE;
        } else {
            //检验18位身份证的校验码是否正确。
            //校验位按照ISO 7064:1983.MOD 11-2的规定生成，X可以认为是数字10。
            $arr_int = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
            $arr_ch = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];
            $sign = 0;
            for ($i = 0; $i < 17; $i++) {
                $b = (int)$value{$i};
                $w = $arr_int[$i];
                $sign += $b * $w;
            }
            $n = $sign % 11;
            $val_num = $arr_ch[$n];
            if ($val_num != substr($value, 17, 1)) {
                return FALSE;
            } else {
                return TRUE;
            }
        }
    }

    /**
     * Get the validation error message.
     *
     * @return string|array
     */
    public function message()
    {
        return '身份证验证不通过';
    }
}